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		<title>第三次作业</title>
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		<center>
			<h2>图书滞销 帮帮我们</h2>
			<p>全场图书一律七折</p>
			<p>自由挑选限购五本</p>
			<p>童叟无欺绝对正品</p>
			<p>装帧精美内容丰富</p>
			
			
			
			<form>
				第一本图书金额：<input type="number" id="book1" /><br />
				第二本图书金额：<input type="number" id="book2" /><br />
				第三本图书金额：<input type="number" id="book3" /><br />
				第四本图书金额：<input type="number" id="book4" /><br />
				第五本图书金额：<input type="number" id="book5" /><br />
			</form>
			<br />
			
			<input id = "sum" type="button" value="结算" onclick="add()">
			<input id = "change" type="button" value="找零" onclick="loose()" />
			<br /><br />
			<img src="img/image.jpg" />
			
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